Scanner Mechanism; Document Feeding And Ejecting Mechanism; Scanner - Brother MFC8500 Service Manual

2.1

Scanner Mechanism

2.1.1

Document feeding and ejecting mechanism

This mechanism consists of the document stacker, automatic document feeder (ADF), document
ejection roller ASSY, and document sensors. (For details about the sensors, refer to Section 2.3.)
If you set documents on the document stacker with their faces down and start scanning operation,
then the scanner motor rotates so that the ADF (which consists of the document take-in roller ASSY,
nip-related parts, separation roller ASSY, and ADF parts) feeds those documents into the
equipment, starting from the bottom sheet (first page) to the top (last page), page by page. Each
document advances with the document feed roller ASSY to the scanner, and then it is fed out of the
equipment with the document ejection roller ASSY.
2.1.2

Scanner

The scanner uses a contact image sensor (CIS) unit which consists of an LED array illuminating
documents, a self-focus lens array collecting the reflected light, a CIS PCB carrying out
photoelectric conversion to output picture element data, and a cover glass on which a document
advances. When the document passes between the document pressure bar and the cover glass, it
is scanned.
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